FEL selection mirror

A mirror selects whether FEL1 or FEL2 is transmissed via the FELIX optical transport system. The mirror hangs from the ceiling of the vault, precisely below the FELIX diagnostic station. The mirror is remotely controlled via ethernet (ETH484-11).

Schematic of FEL selection mirror system. FEL2 (blue line) is normally transmitted to a mirror (light blue circle) that reflects it up towards the diagnostic station. An actuator can insert an additional mirror (yellow circle) to block FEL2 and to couple in FEL1 (red line) instead.

Both beams arrive vertically polarized at the entrances of the box.

Free-electron laser